I'm with Glen on this. It's only going to be used when there's a general problem or a very specific incident. Both of these are exceedingly rare on canals and most of the other waterways on which we boat.
I might amble along the GU after a beer or two, but I wouldn't enter Gloucester Lock when there's some fresh on the river. You can always argue about definitions in rules as any cut-off point is going to be the result of a compromise - and set at some least-worst and somewhat arbitrary point. If you are going to argue against it, you really need to argue for a different compromise. There are much more important things to worry about! -- Nigel Stanley
